Could someone tell me about connecting EV with HCP as primary storage and secondary storage via S3 protocol?
How it's working?
What are the benefits or problems?
Is it better to connect HCP to EV via streamer or S3 protocol?
Check this article
Although from 2019, it is still valid. I personally would opt for the streamer, but your call. You should be able to test.
configure it, archive some items (with a retention of a day, so you can delete), and see which best fits your needs.